Lifting-jack



(No Model.)

L. B. HOIT.

LIFTING JACK. No. 390,671. Patented Oct. 9, 1888.

43/; a K c 15.2.

8 @W' fiame, lb B NITEID STATES I PATENT Cri ical LORA B. HOIT, OFWORCESTER, I\IASSAOHUSETTS.

LlFTlNG-JACK.

SPECIFICATION forming part of Letters Patent No. 390,671, dated October9, 1888.

Application filed December 14, 1887. Serial No. 257,847. (No model.)

To aZZ whom it may concern:

Be it known that I, LORA B. Hour, of Worcester, in the county of\Vorcest'er and State of Massachusetts, have invented certain new anduseful Improvements in Lifting-Jacks, of which the following is aspecification, reference being had to the accompanying drawings, and tothe letters of reference marked thereon.

The object of my invention is to provide a lifting-jack that can bethrown under an axle without the lever becoming separated from thestandard; also, to provide means whereby the axle shall be preventedfrom slipping down the lever or binding against the standard whenlifting on a high pitch; and also to increase the leverage withoutlengthening the lever.

My invention consists in the several details of construction andarrangement, as fully set forth in the following specification andclaim.

In the drawings, Figure 1 is a perspective view of my improvedlifting-jack, and Fig. 2 is a vertical section.

Similar letters of reference indicate similar parts in the respectivefigures.

A is the standard, which is made of malleable metal, and provided on thelower portion of its front edge with a series of notches, a, and on theupper portion of its rear edge with a series of notches, a. The upperend of the standard is formed into a hook, at", for a purposehereinafter described.

B is a metal concave shell, which serves asa base to support thestandard A. The base B is provided with a slot or mortise, b, and thelower end of the standard A with a tenon, b, which fits into themortise, and is secured therein by means of a rivet N, Fig. 1; or

the base and standard may be secured together by hammering out the endof the tenon on the standard to form a rivct-head, as shown in Fig. 2.

O is a lever longitudinally slotted at 0, so as to adapt it' to fit overthe standard in the manner shown. Each side of the forward end of thesaid leveris provided with a metallic plate, D, the plates being rivetedto thelever and to each other by rivets d. The central rivet, d,constitutes the fulcrum of the lever, and is adapted to rest in any ofthe notches a. The central rivet, d, is so located as to make the csomewhat less than the width of the hookshaped top of the standard, forthe purpose of preventing the lever from slipping off the standardunless the long end of the lever is lowered, when it can be taken off.

The plates D are provided with lugs or ears d which extend upward abovethe upper face of the lever O, and are for the purpose of preventspacebetween it and the front edge of the slot ing the axle from bindingagainst the standard I or slipping down on the lever when lifting on ahigh pitch. The plates Dalso serve as aprotection to the end of thelever O and keep it from being cut away by constantly coming in contactwith the axles of carriages.

E is a shackle or link loosely hung to the top of the lever O, and heldthereto by a plate or cap, 6, riveted to the lever. The forward end ofthe shackle or link is fitted to enter any of the notches a at the frontedge of thestandard.

By making the standard and base-support of metal and riveting themtogether a very durable article is produced, as they are not likely toget loose, and will not rot, as is the case where wood or wood and ironare used. The peculiar construction of the base gives it strengthwithout great weight. By making the standard of this class of jacks ofmalleable metal instead of wood, or wood strengthened with iron plates,the width of the standard can be reducedone-half and still retainstrength sufficient for all ordinary purposes; and by having thestandard narrower the fulcrum-point of the lever can be brought nearerto its lifting end than heretofore, and thereby increase the leveragewithout lengthening the long arm or shortening the short arm.

In using jacks of this class it is a common occurrence for the operatorto swing the jack under the body of the carriage to be lifted, simplyholding it by the lever; but in doing this the lever often slips off thestandard and so causes annoyance and delay. To obviate this difficultyis the object of the hook on the upper end of the standard, which willengage with the fulcrum-rivet d and allow the standard to swing freelywithout danger of being detached from the lever.

Having described my invention, I claim- The herein described lifting-jack, which consists ofthe following elements, viz: a hot to the leverand fitted to enter either of the low base, astandard riveted thereto,said standnotches at the front edge of the standard, all ard beingprovided with a series of notches at arranged and eo operatingsubstantially as its front and rear edges and having a hook atspecified.

5 its upper end, aleverhavingafulerum adapted In testimony whereof Ihave hereunto set my 15 to rest in either of the notches at the rearedge hand and seal.

0f the standard, metal plates riveted to the sides LORA 1-3. 11011. [Inl] of thelever at its lifting end, said plates having Vitnesses: lugsextending upwardly above the upper face HENRY M. BOYD,

[O of the lever, and a shackle orlink loosely hung XVM. CARL.

